22
Control strategy,
continued
Strategy,
continued
Action
Temp.
sensor
°C
Up
Do
wn
°C
Temp.
sensor
Action
Condenser fan will increase speed
by 30 RPM each 30 seconds as
long as condenser is 1 or more
degrees above 47 °C until
maximum 1400 RPM is reached
Condenser 48 °C
Condenser fan speed constant
somewhere between 450 RPM and
1400 RPM
Condenser 47 °C
Condenser fan will decrease speed
by 30 RPM each 1 seconds as
long as condenser is 1 or more
degrees below 47 °C until
minimum 450 RPM is reached
Condenser 46 °C
Internal fan will increase speed by
50 RPM each 30 seconds as long
as return is 1 or more degrees
above set point until max 1550
RPM is reached
Return
28 °C
"Compressor on Damper closes
Internal fan will decrease speed
with 50 RPM each 30 seconds as
long as return is on or below set
point"
Return default
compressor
set point
27 °C
26 °C Return
"Compressor off after 9 minutes if
return is 1 or more degrees below
set point
If after compressor stop and 60
second pause ambient is 2 to 7
degrees below set point the
damper will open for 90 seconds to
use free cooling instead of active
cooling
If after compressor stop ambient is
7 to 30 degrees below set point the
damper will open for 90 seconds to
use free cooling
If after compressor stop ambient is
30 or more degrees below set point
the damper will open for 45
seconds to use free cooling"
22 °C Return
Compressor off unconditionally if
return is 5 °C below set point
Internal fan 700-1000 RPM
External fans 750-1050 RPM
Damper modulating aiming at
Return = 24°C
Ambient
-40
°C to
25 °C
6 °C
to 26
°C
Return
Internal fan 700-1000 RPM
External fans 750-1050 RPM
Damper modulating aiming at
Return = 24 °C
Heater off
Return
6 °C
Internal fan 1000 RPM
Return default
heater set
point
5 °C
